Head-to-Head Comparison · Alternative to Mailgun · 📬 email
Mailgun vs Sessy
Track SES deliveries, bounces, opens and clicks in a self-hosted dashboard with real-time search, analytics and reputation monitoring. Here is how Sessy ($0/mo open source) stacks up against Mailgun ($15/mo) across cost, hosting, data privacy, and real-world trade-offs.
Sessy is a verified Open Source-licensed open-source replacement for Mailgun. Switching from Mailgun ($15/mo) saves $180/yr per solo seat, or $900/yr for a 5-person team. Deployment: Runs on Self-host.
The catch: Requires self-hosting setup, updates, and server maintenance compared to managed Mailgun.
Mailgun vs Sessy Specifications
facts verified 2026-11-07
| Dimension | Mailgun (Paid) | Sessy (Replacement) |
|---|---|---|
| Monthly Price | $15 / mo | $0 / mo |
| 1-Year Cost (1 seat) | $180 / yr | $0 / yr (Save $180) |
| 1-Year Cost (5 seats) | $900 / yr | $0 / yr (Save $900) |
| 1-Year Cost (10 seats) | $1,800 / yr | $0 / yr (Save $1,800) |
| Source & License | Proprietary SaaS | open source Open Source |
| Where It Runs | Vendor Cloud | Self-host (your server) |
| Platforms | Web / Cloud | webself-hosteddocker to self-host |
| GitHub Stars | — | ★ 945 (active nov 2026) |
Deep Dive: Switching from Mailgun to Sessy
Trade-offs, installation & data architecture
What you trade away
Requires self-hosting setup, updates, and server maintenance compared to managed Mailgun.
How to deploy Sessy
Clone https://github.com/marckohlbrugge/sessy or deploy with Docker Compose
What it takes to run
Deploy via Docker or binary release from GitHub and configure environment variables.
Where your data lives
All application data and configuration live on your own server or local database.
Why fork Sessy instead of vibe-coding a Mailgun clone?
Instead of paying recurring SaaS fees for Mailgun or rebuilding it from scratch, deploy one of the 7 battle-tested open-source alternatives like Billion Mail.
Mailgun vs Sessy FAQ
Is Sessy a good free alternative to Mailgun?+
Yes. Sessy is a verified open-source (Open Source) replacement for Mailgun. Track SES deliveries, bounces, opens and clicks in a self-hosted dashboard with real-time search, analytics and reputation monitoring.
What is the catch when switching from Mailgun to Sessy?+
Requires self-hosting setup, updates, and server maintenance compared to managed Mailgun.
How much do you save switching from Mailgun to Sessy?+
Mailgun costs $15/mo ($180/yr) per seat, whereas Sessy is $0/mo. Switching saves $180/yr for a solo user, $900/yr for a 5-person team, and $1,800/yr for a 10-person team.
How do I install or self-host Sessy instead of Mailgun?+
Install: Clone https://github.com/marckohlbrugge/sessy or deploy with Docker Compose. Setup: Deploy via Docker or binary release from GitHub and configure environment variables.
